Latch Relays | McMaster-Carr

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29 Products

Sequenced Latching Relays

These relays switch through a series of different circuit configurations every time they receive an input voltage. The input voltage latches them in position, so they don’t require a constant voltage to stay switched. Use them to control motors, pumps, and lighting. The covered terminals prevent contact with live connections. Mount to 35 mm DIN rail. Also known as step relays.

For technical drawings and 3-D models, click on a part number.

1 Circuit Controlled—SPST-NO
Switch Starting Position	Input Voltage	Control Power	Switching Current @ 120V AC	Max. Switching Voltage	hp @ Switching Voltage	Ht.	Wd.	Dp.		Each
With 4 Terminals
1st Signal—1 Off (Normally Open) 2nd Signal—1 On (Normally Closed)	24V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	000000
1st Signal—1 Off (Normally Open) 2nd Signal—1 On (Normally Closed)	120V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) 2nd Signal—1 On (Normally Closed)	240V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) 2nd Signal—1 On (Normally Closed)	12V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) 2nd Signal—1 On (Normally Closed)	24V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
2 Circuits Controlled—DPST-1NO/1NC
With 6 Terminals
1st Signal—1 Off (Normally Open) and 1 On (Normally Closed) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open)	24V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) and 1 On (Normally Closed) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open)	120V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) and 1 On (Normally Closed) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open)	240V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) and 1 On (Normally Closed) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open)	12V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—1 Off (Normally Open) and 1 On (Normally Closed) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open)	24V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
2 Circuits Controlled—DPST-NO
With 6 Terminals
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	24V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	120V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	240V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	12V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—2 On (Normally Closed)	24V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	24V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	120V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	240V AC	6.5VA	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	12V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000
1st Signal—2 Off (Normally Open) 2nd Signal—1 On (Normally Closed) and 1 Off (Normally Open) 3rd Signal—2 On (Normally Closed)	24V DC	5W	16A	277V AC	1/2 hp @ 120 V AC	3.3"	0.7"	2.4"	00000000	00000

Latching Relays

9-Terminal Relay

10-Terminal Relay

9-Terminal Relay Socket

10-Terminal Relay Socket

A single, momentary input voltage switches these relays and latches them in position, so they don't require a constant input voltage to stay switched. A second momentary voltage will release the latch.

Relay sockets (sold separately) mount to 35 mm DIN rail (also known as DIN 3 rail) for fast installation.

Relays											Relay Sockets
Number of Terminals	Input Voltage	Control Current, mA	Switching Current @ 240V AC/24V DC	hp @ Switching Voltage	Ht.	Wd.	Dp.	Quick-Disconnect Tab Wd.		Each		Each
2 Circuits Controlled with 2 Off (Normally Open) or 2 On (Normally Closed)—DPDT
9	24V AC	70	10A	1/3 hp @ 120 V AC 1/2 hp @ 240 V AC	1.4"	1.5"	1.9"	0.187"	0000000	000000	0000000	000000
9	120V AC	14	10A	1/3 hp @ 120 V AC 1/2 hp @ 240 V AC	1.4"	1.5"	1.9"	0.187"	0000000	00000	0000000	00000
9	12V DC	100	10A	1/3 hp @ 120 V AC 1/2 hp @ 240 V AC	1.4"	1.5"	1.9"	0.187"	0000000	00000	0000000	00000
9	24V DC	50	10A	1/3 hp @ 120 V AC 1/2 hp @ 240 V AC	1.4"	1.5"	1.9"	0.187"	0000000	00000	0000000	00000
10	24V AC	27	3A	__	1.1"	0.8"	1.4"	0.102"	0000000	000000	0000000	00000
10	12V DC	110	3A	__	1.1"	0.8"	1.4"	0.102"	0000000	00000	0000000	00000
10	24V DC	52	3A	__	1.1"	0.8"	1.4"	0.102"	0000000	00000	0000000	00000